[PATCH] D111768: [IPT] Restructure cache to allow lazy update following invalidation [NFC]

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

Not seeing any practical impact from this, but the change generally looks reasonable to me.



================
Comment at: llvm/lib/Analysis/InstructionPrecedenceTracking.cpp:52
+    // Seed the lazy scan
+    FirstSpecialInsts[BB] = &*BB->begin();
+
----------------
To avoid doing the BB lookup three times, use something like this?
```
auto It = FirstSpecialInsts.try_emplace(BB, &BB->front()).first;
Instruction *CurI = It->second;
// ...
It->second = Res;
```


Repository:
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https://reviews.llvm.org/D111768